Transforming with map()

The map() method creates a new array by transforming each element. It's the most common way to reshape JSON data.

Basic map() Usage

Transforming Objects

Extract or reshape object properties:

Using Index Parameter

Nested Transformations

Exercise: Extract Names

Exercise: Calculate New Values

Key Points

• map() returns a new array (doesn't modify original)
• Transform each element with a callback function
• Access index as second parameter
• Use spread operator to copy and extend objects
• Chain with other array methods